Cmos checksum error 502 on HP Pavilion Laptop PC 14-dv0065st

[charger352006]

Hello, I purchased my HP Pavilion Laptop PC 14-dv0065st, approximately a month and a half ago and it has been a nightmare...  When ever I turn my laptop off for a period of time, for instance today for three hours waiting for tech to call me back I get a check sum 502 after several minutes wait to turn on.  Its very embarrassing as I purchased this as a business machine that I need for zoom and court.  I have had 3 calls to customer tech support and they keep having me reset my bios to default, negative results with the issue.  I have updated the bios as well.  I am trying to see if they used a crappy bios battery, but cannot find the location of the battery.  This is a new unit, the first problem I have had with HP and never had problems like this with DELL.  How do we fix this without sending the unit back for a new bios, this is crazy..  thanks everyone for looking..  Sean.

[Echo_Lake]

@charger352006

Thank you for posting on HP Support Community.

Don't worry as I'll be glad to help, I understand that you're getting a CMOS Checksum error. 
I have a few troubleshooting steps we could try to fix the issue

1. Turn off the computer and wait five seconds.

2. Turn on the computer.

3. When the first screen displays, do one of the following:

   • Immediately press the F10 key repeatedly, about once every second, until the Computer Setup program opens.

   • Immediately press the Escape key repeatedly, about once every second, until the Startup menu opens. Then press F10 to open the Computer Setup program.

4. In the BIOS Setup utility, select the File tab.

5. Select Apply Defaults and Exit.

   Figure : Setting the defaults

   

   The computer restarts.

   If the error no longer appears, you are done.

   If the error appears, continue using these steps.

6. Replace the battery on the motherboard.

7. After replacing the battery, restart the computer to see if the error continues.

   If the error no longer appears, wait until Windows opens and set the date and time to current settings.

   If the error still appears, the default BIOS information has become corrupted. The computer requires service or a new motherboard.

Hope this helps! Keep me posted for further assistance.
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